Modification method and rare earth Y-type molecular sieve

Abstract

A modification method of a Y-type molecular sieve comprises the following steps: enabling the rare earth NaY molecular sieve to be in contact with an alkaline substance to obtain the rare earth NaY molecular sieve containing the alkaline substance, and performing hydrothermal roasting treatment in an atmosphere environment of externally applying pressure and externally adding water, wherein the apparent pressure of the atmosphere environment is 0.01-1Mpa, and the atmosphere environment contains 1-100% of water vapor.

Description

technical field [0001] The invention relates to a modification method and the obtained rare earth Y-type molecular sieve. Background technique [0002] Catalytic cracking is the most important production technology in today's oil refinery. The catalytic cracking unit is used to convert heavy oil and residual oil into gasoline, diesel and light gas components. In industry, the catalytic cracking unit must include two parts: reaction and catalyst high-temperature regeneration, so catalysts need to consider factors such as catalytic activity and selectivity. Compared with other types of molecular sieves, Y-type molecular sieves are more used in cracking reactions. As an active component of catalytic cracking catalyst, its main function in catalytic cracking catalyst is responsible for the production of molecular products in the gasoline range. [0003] The rare earth Y molecular sieve exchanged by rare earth is a highly active component of catalytic cracking catalyst. The rar...

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Problems solved by technology

However, when the NaY molecular sieve is ion-exchanged with the aqueous solution of the rare earth salt, it is difficult for the hydrated rare earth ions with a diameter of about 0.79 nm to enter the sodalite cage through the six-membered ring window of the Y molecular sieve (about 0.26 nm in diameter).

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